Automatic elevator-guard



(No Model.)

J. F. ABBOTT. AUTOMATIC ELEVATOR GUARD.

Patented Feb. '7, 1882 l Ell-=55:

N. PETERS. Phnlnkithogmphnr, Washinghan. n. c

NrrEn STATES JEREMIAH F. ABBOTT, OF REVERE,

ASSIGNOR OF ONE-HALF TO MARIE BROFEE ROBBINS, OF BOSTON, MASSACHUSETTS.

AUTOMATIC ELEVATOR-GUARD.

SPECIFICATION forming part of Letters Patent No. 253,172, dated February 7, 1882.

Application filed Deccmber27, 1881.

To all whom t'tmay concern Be it known that I, JEREMIAH F. ABBOTT, a citizen of the United States, residing at Revere, in the county of Sufi'olk and State of Massachusetts, have invented certain new and useful Improvements in Automatic Elevator- Guards; and I do hereby declare that the same are fully described in the following specification and illustrated in the accompanying drawin gs.

This invention relates to improvements in automatic elevator-guards; and it consists essentially of a balanced head or weight upon the end of the guard, which head is supported on two fulcra on a tumbler arranged to turn in bearings in the upper end of a suitable support, the said tumbler having jointed to ita downward-projecting rod, which is actuated by means of suitable connecting mechanism from a wedge or projection on the elevator-platform or other part-of the movable elevator, so that when the elevator-platform reaches the floor where the guard is located the tumbleristurned on its axis, and in so doing transfers the support of the weighted head of the guard from one fulcrum of the said tumbler to the other, and thereby causes the guard to rise automatically to an upright position, or nearly so, and to remain in such a position as long as the elevator-platform remains at the floor where the guard is located, and when the platform of the elevator passes by said floor, either in its ascent or descent, the tumbler is swung to its normal position by the influence of a suitable spring, causing the weight of the head to be supported on the other fulcrum of the tumbler,

by which the guard is caused to descend auto- Inatically by the force of gravity. The two 'fulera on the tumbler are arranged one on each side of the center ofgravity of the guard and head combined, and it will thus be understood that by simply changing the fulcrum on which the head and guard is supported to the right or left of the center of gravity of such' head and guard the latter is caused to open or close by the force of gravity only, without the need of positive and complicated connecting mechanisms, which are liable to get out of order, so as to stick and prevent the guard from opening and closing at the requisite time.

The invention is fully represented in the ac- (No model.)

companying drawings, on which Figure lrepresents a side-elevation of the improved guard shown closed. Fig. 2 represents a longitudinal section of the same in the same position. Fig. 3 represents a cross-section on the line A B, shown in Fig. 1. Fig. at represents an enlarged sectional view of the weighted head and upper part of support with its tumbler, and showing in-dotted lines the guard as being open. Fig. 5 represents a rear view of the tumbler.

Similar letters refer to similar parts wherever they occur on the ditl'erent parts of the drawings.

a in Fig. 3 represents one of the floors in a building communicating with the elevator-well, in which the elevator-platform b is movable up and down, as usual.

To the floor a is secured the hollow post 0, having bearings c e in its upper end for the trunnions d d of the tumbler (l, as shown. The tumbler d is provided on one side with a stud or crank-pin, d, to which the upper end of the link or rod 6 is hinged, the lower end of such link being connected to the small leverf, which is movable on the fulcrum-pin f, and provided with a forked projection, f, which embraces a pin or stud, g, on the laterallymovable rod 9, that is capable of alateral motion in bearings or guides c o in the lower part of the post 0. Upon the outer end of the rod 9 is an anti friction wheel or roller, g, which is acted on by aninclined cam or projection, Z),

(shown in dotted lines inv Fig. 3,) attached to the elevator-platform b, or any other desired part of the movable elevator-car or frame-work.

f,is another projection on the small lever f, which is acted upon by the spring h, so as tohold the lever f f in the normal position shown in Fig. 3 before and after the contact of the incline b" and roller g.

The tumbler d is provided with two fulcrum pins, D and D, one on each side of the axis of, the fulcrum-pins d d, as shown in Figs. 2, 4,

and 5.

It is the'metallic head, to which the guard 70 is secured.

k is a balance-weight at the rear of the head 7a, which weight may be firmly secured to said head It, or cast in one piece with it or made adjustable therein, as may be desired.

k" is a stop-projection on the outside of the rear end of the weighted head 70, which comes in contact with the post 0 when the guard is fully open, and thus prevents its swinging farther than to an upright position. In the head is are made notches K and K, one on each side of a central projection, K, which notches serve as bearings for the head 70 to rest loosely on the fulcra D and Dof the tumbler (I when the guard k is down in the position as shown in Figs. 1' and 2 and in full lines of Fig. 4.

K is an opening through the head k, below the notches K and K, so as to enable the guard k to be swung 011 the fulcrum D to an upright position, if so desired, without disturbing the connecting mechanism below to the elevatorplatform.

The operation is as follows: When the platform b descends in the direction of the arrow shown in Fig. 3, as it approaches the floor a the incline 1) comes in contact with the roller g and forces it back, as well as its rod g, the pin 9 of which acts on the projection f on the lever f, and swings them on the fulcrum j, and in so doing pulls the link 0 downward. The latter, being connected to the tumbler d, as described, when pulled downward, causes the tumbler d to be turned around its trunnions d d to the position shown in (lotted lines in Fig. 4, and while it is so being turned the weight of the head 7c and its guard k is relieved from the fulcrum D and transferred to the fulcrum D, by which the head k is caused to swing by its own gravity to the position shown in dotted lines in Fig. 4, and thus raising the guard It. When the incline b has passed entirely beyond the roller g, either in an up or down motion of the elevator-platform I), the leverff, rod 9, roller 9, and link 0 are automatically returned to their normal positions (shown in Fig. 3) by the influence of the spring h on the projectionf causing the tumbler d to be swung on its trunnions d d to the normal position shown in Fig.2, during which time the weight of the head 70 and guard k is transferred from the fulcrum D to the fulcrum D, and thus causing the guard to descend by its own gravity until it reaches the position shown in Figs. 1 and 2, when its head It rests equally on both fulcra D D. A rest may be provided for the outer end of the guardv it when in its lowest position, as usual.

I wish to state that I do not confine myself to the exact connecting mechanism from the tumbler (Z to the elevator-platform b, as shown in the drawings, as these may be changed and equivalent devices substituted without departing from the essential part of my invention.

Having thus fully described the nature, construction, and operation of my in ven tion, I wish to secure by Letters Patent, and claim- 1. In an elevator-guard, the head k, with its two supports, K K, the tumbler (I, located in bearings in the post 0, and having two fulcra, D and D, located on two opposite sides of the center of gravity of the head and guard 70 k, as and for the purpose set forth.

2. In an elevator-guard, the head k, with its supports K K, the tumbler d, having fulcra D D and trunnions d 01, arranged in hearings on the post a, and the connecting mechanism 0 ff fj g g g h, or its equivalent, combined with a projection or wedge, 11, on the elevator I), as and for the purpose set forth.

In testimony whereof I have afiixed my signature in presence of two witnesses.

JEREMIAH F. ABBOTT.

YVitnesses:

ALBAN ANDREN, HENRY OHADBOURN. 

